Method and device for switching

ABSTRACT

A switching method and device are disclosed by the present invention. The switching method according to the embodiments of the present invention includes: receiving from a base station a switching indication information that requires a UE to switch a TTI; sending to the base station a switching confirmation information with which the switching indication information is confirmed; and switching the TTI. The switching method according to the embodiments of the present invention includes: sending to a UE a switching indication information that requires the UE to switch a TTI; and receiving from the UE a switching confirmation information with which the switching indication information is confirmed. By using the switching method and device according to the embodiments of the present invention, the delay of switching the TTI can be shortened and the TTI can be switched quickly.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a continuation of International Application No. PCT/CN2009/071493, filed on Apr. 27, 2009, which is hereby incorporated by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to the field of communications technologies, and in particular, to a method and device for switching.

BACKGROUND OF THE INVENTION

High speed uplink packet access (HSUPA) is a technology introduced in the 3rd Generation Partnership Project (3GPP) Release 6 (R6). This technology is optimization and evolution directing to packet services in the uplink direction (direction from a mobile terminal to a radio access network). Using self-adaptation encoding, physical-layer hybrid retransmission, Node B-based fast scheduling, and 2-ms transmission time interval (TTI)-based short-frame transmission, HSUPA enhances the highest data transmission rate and cell throughput, and reduces the delay.

HSUPA further reduces the transmission delay by using the 2-ms TTI transmission mode. However, 2-ms TTI-based short-frame transmission mode is not applicable to the user equipment (UE) that works at the edge of a cell. Therefore, the coverage of the UE is narrowed down. Especially in the case of a period of time after the UE's total transmit power reaches the maximum transmit power, the 2-ms TTI needs to be switched to 10-ms TTI to enhance the uplink coverage. The detailed process is as follows:

(1) The network configures 6d event for the UE by a measuring control message.

(2) When the UE transmit power reaches the maximum allowable transmit power and stays for a period of time, the UE reports a measurement report to the network.

(3) Upon receiving the measurement report, a radio network controller (RNC) judges whether the UE uplink transmit power is limited, and sends a reconfiguration message (may include a radio bearer reconfiguration message, transmission channel reconfiguration message) to the UE to reconfigure the TTI length.

(4) Upon receiving the reconfiguration message, the UE performs the reconfiguration according to the reconfiguration message at a time specified by the network to implement switching from 2-ms TTI to 10-ms TTI.

As described above, in the prior art, the UE reports 6d event and the RNC judges, according to 6d event, whether the UE transmit power is limited, and initiates the reconfiguration message to configure the UE for TTI switching. Therefore, the delay is long when the UE switches to 10-ms TTI transmission mode.

SUMMARY OF THE INVENTION

The major objective of embodiments of the present invention is to reduce the delay of switching transmission time interval (TTI).

In order to achieve the above objective, an embodiment of the present invention provides a method for switching. The method includes:

-   -   receiving a switching indication information that requires a UE         to switch a TTI, where the switching indication information is         sent by a base station;     -   sending to the base station a switching confirmation information         with which the switching indication information is confirmed to         the base station; and     -   switching the TTI.

Another embodiment of the present invention also provides a method for switching. The method includes:

-   -   sending to a UE a switching indication information that requires         the UE to switch a TTI; and     -   receiving from the UE a switching confirmation information with         which the switching indication information is confirmed.

An embodiment of the present invention provides a UE. The UE includes:

-   -   a first receiving module, configured to receive a switching         indication information that requires switching a TTI and is sent         from a base station;     -   a sending module, configured to send to the base station a         switching confirmation information with which the switching         indication information is confirmed; and     -   a processing module, configured to switch the TTI.

An embodiment of the present invention provides a base station. The base station includes:

-   -   a first sending module, configured to send to a UE a switching         indication information that requires the UE to switch a TTI; and     -   a receiving module, configured to receive from the UE a         switching confirmation information with which the switching         indication information is confirmed.

Based on the preceding technical solutions, in embodiments of the present invention, the base station directly instructs the UE to switch the TTI. Therefore, the notification sent from the Node B to RNC to instruct UE to switch the TTI is avoided. The delay of switching the TTI is shortened, so as to implement quick TTI switching.

BRIEF DESCRIPTION OF THE DRAWINGS

The following describes the embodiments of the present invention with reference to the accompanying drawings.

FIG. 1 is a flowchart of a method for switching according to an embodiment of the present invention;

FIG. 2 is a flowchart of a method for switching according to another embodiment of the present invention;

FIG. 3 is a flowchart of a method for switching according to still another embodiment of the present invention;

FIG. 4 is a flowchart of a method for switching according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for switching according to another embodiment of the present invention;

FIG. 6 is a structure schematic diagram of a UE according to an embodiment of the present invention;

FIG. 7 is a structure schematic diagram of a UE according to another embodiment of the present invention;

FIG. 8 is a structure schematic diagram of a UE according to still another embodiment of the present invention;

FIG. 9 is a structure schematic diagram of a base station according to an embodiment of the present invention; and

FIG. 10 is a structure schematic diagram of a base station according to another embodiment of the present invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

To make the technical solutions of the present invention clearer, the present invention is illustrated with reference to the accompanying drawings and embodiments.

Referring to FIG. 1, an embodiment of the present invention provides a method for switching. The method includes:

Step S110: Receive a switching indication information that requires a UE to switch a TTI and is sent from a base station.

Step S120: Send to the base station a switching confirmation information with which the switching indication information is confirmed.

Step S130: Switch the TTI.

The UE includes but not limited to the mobile phone, laptop, personal digital assistant (PDA), play station portable (PSP), and portable multimedia projector.

When the UE receives the switching indication information that requires the UE to switch the TTI, for example, when the base station requires the UE to switch from the 2-ms TTI to the 10-ms TTI, the UE sends, according to the received switching indication information, a switching confirmation information to confirm that the switching indication information is received and the TTI is to be switched. Subsequently, the UE switches the TTI, for example, switching from the 2-ms TTI to the 10-ms TTI. Accordingly, the UE may shorten the delay of switching the TTI, so as to switch the TTI quickly.

In step S110 of the embodiment, the base station may carry the switching indication information by sending a high-speed shared control channel (HS-SCCH) order or by using other proper manners.

The HS-SCCH order physical channel transmits the following contents:

1. Order types: x_(odt,1), x_(odt,2), x_(odt,3), 3 bits

2. Order contents: x_(ord,1), x_(ord,2), x_(ord,3), 3 bits

3. UE identifiers (IDs) x_(ue,1), x_(ue,2), . . . , x_(ue,16), 16 bits

When the base station sends an HS-SCCH order, χ_(odt,1), χ_(odt,2), χ_(odt,3) indicate the order types, and χ_(ord,1), χ_(ord,2), χ_(ord,3) indicate the order contents. The HS-SCCH order, undergoing a series of encoding processing, is notified to the UE over the radio channel. The order types and contents can be set to carry the switching indication information that requires the UE to switch the TTI.

When the order types x_(odt,1), x_(odt,2), x_(odt,3) are set to “001”, either the order content x_(ord,1) or x_(ord,2), or both of the order contents x_(ord,1) and x_(ord,2) may be set to carry the indication information. When the order types x_(odt,1), x_(odt,2), and x_(odt,3) are set to any binary combination except “000” and “001”, the order content x_(ord,1), x_(ord,2) or x_(ord,3), or any combination of the order contents x_(ord,1), x_(ord,2) and x_(ord,3), may be set to carry the indication information.

For example, the order types x_(odt,1), x_(odt,2), and x_(odt,3) may be set to “001” and x_(ord,1) may be set to “1” to instruct the UE to switch the TTI; and the order types x_(odt,1), x_(odt,2), and x_(odt,3) may be set to “001” and x_(ord,1) may be set to “0” to instruct the UE not to switch the TTI.

In this embodiment, the base station uses the HS-SCCH order to carry the switching indication information that requires the UE to switch the TTI. In this way, the existing resources are made full use of, the resource utilization rate is improved, the operation is simple and easy for implementation, and better compatibility with the prior art is achieved.

In step S120 of the above embodiment, the UE may carry the switching indication confirmation information by sending an enhanced dedicated transport channel (E-DCH) transport format combination indicator (E-TFCI) corresponding to a transport block (TB), which is forbidden to be used within a current TTI, on an E-DCH dedicated physical control channel (E-DPCCH).

For example, when the base station requires the UE to switch from the 2-ms TTI (current TTI) to the 10-ms TTI, in any mapping table between the E-TFCI and TB size, at least one TB is forbidden. The size of the forbidden TB is N/A. Tables 1 and 2 respectively list the mapping between the E-TFCI and TB size in case of the 2-ms TTI. In Table 1, when the E-TFCI is 120, the corresponding TB size is N/A, and the TB is forbidden. In Table 2, when the E-TFCI is 101, the TB size is N/A, and the TB is forbidden; or when the E-TFCI is 102, the TB size is N/A, and the TB is forbidden.

TABLE 1 E-T TB Size FCI (Bit) 0 18 1 120 2 124 3 129 4 133 5 138 6 143 7 149 8 154 9 160 10 166 11 172 12 178 13 185 14 192 15 199 16 206 17 214 18 222 19 230 20 238 21 247 22 256 23 266 24 275 25 286 26 296 27 307 28 318 29 330 30 342 31 355 32 368 33 382 34 396 35 410 36 426 37 441 38 458 39 474 40 492 41 510 42 529 43 548 44 569 45 590 46 611 47 634 48 657 49 682 50 707 51 733 52 760 53 788 54 817 55 847 56 878 57 911 58 944 59 979 60 1015 61 1053 62 1091 63 1132 64 1173 65 1217 66 1262 67 1308 68 1356 69 1406 70 1458 71 1512 72 1568 73 1626 74 1685 75 1748 76 1812 77 1879 78 1948 79 2020 80 2094 81 2172 82 2252 83 2335 84 2421 85 2510 86 2603 87 2699 88 2798 89 2901 90 3008 91 3119 92 3234 93 3353 94 3477 95 3605 96 3738 97 3876 98 4019 99 4167 100 4321 101 4480 102 4645 103 4816 104 4994 105 5178 106 5369 107 5567 108 5772 109 5985 110 6206 111 6435 112 6672 113 6918 114 7173 115 7437 116 7711 117 7996 118 8290 119 8596 120 N/A 121 9241 122 9582 123 9935 124 10302 125 10681 126 11075 127 11484

TABLE 2 E-T TB Size FCI (Bit) 0 18 1 186 2 204 3 354 4 372 5 522 6 540 7 558 8 674 9 692 10 708 11 858 12 876 13 894 14 1026 15 1044 16 1194 17 1212 18 1230 19 1330 20 1348 21 1362 22 1380 23 1530 24 1548 25 1566 26 1698 27 1716 28 1866 29 1884 30 1902 31 1986 32 2004 33 2034 34 2052 35 2370 36 2388 37 2642 38 2660 39 2706 40 2724 41 3042 42 3060 43 3298 44 3316 45 3378 46 3396 47 3750 48 3990 49 4086 50 4422 51 4646 52 4758 53 5094 54 5302 55 5430 56 5766 57 5958 58 6102 59 6438 60 6614 61 6774 62 7110 63 7270 64 7446 65 7782 66 7926 67 8118 68 8454 69 8582 70 8790 71 9126 72 9238 73 9462 74 9798 75 9894 76 10134 77 10470 78 10550 79 10806 80 11160 81 11224 82 11496 83 11880 84 12168 85 12536 86 12840 87 13192 88 13512 89 13848 90 14184 91 14538 92 14874 93 15210 94 15546 95 15882 96 16218 97 16554 98 16890 99 17226 100 17562 101 N/A 102 N/A 103 18252 104 18476 105 18588 106 18924 107 19132 108 19260 109 19596 110 19788 111 19932 112 20268 113 20444 114 20604 115 20940 116 21100 117 21276 118 21612 119 21774 120 21966 121 22302 122 22430 123 22638 124 22996

Therefore, when receiving the switching indication information from the base station, for example, the base station requires the UE to switch from the 2-ms TTI to the 10-ms TTI, the UE may send the E-TFCI corresponding to the TB, which is forbidden to be used within the 2-ms TTI, on the E-DPCCH. For example, the UE confirms with the base station that the switching indication information is received and notify all the base stations (including base stations in a serving cell and base stations in a non-serving cell) communicating with the UE that the UE is to switch from the 2-ms TTI to the 10-ms TTI, by using E-TFCI=120 in Table 1 or by using E-TFCI=101 or E-TFCI=102 in Table 2. The base station receives the E-TFCI corresponding to the TB, which is forbidden to be used, after sending the switching indication information to the UE. Therefore, the base station does not mistake the E-TFCI sent on the E-DPCCH as incorrect.

At this time, the UE stops data transmission on an E-DCH dedicated physical data channel (E-DPDCH). The power of the disabled E-DPDCH may be allocated to the E-DPCCH to prevent a case that the base station incorrectly detects or fails to detect the E-DPCCH, so as to further ensure that the base station can correctly demodulate the E-DPCCH. The UE may send the same E-TFCI multiple times within a plurality of continuous TTIs on the E-DPCCH to ensure that the base station receives the E-TFCI correctly. At this time, the base station does not need to feed back an acknowledgement (ACK) or non-acknowledgement (NACK) message. When the times of sending the E-TFCI is determined, it may be preferably considered that the UE can be enabled to consecutively send five subframes or multiple-of-five subframes at the start position of a connection frame number (CFN), and then switch to the 10-ms TTI on the boundary of a next CFN. As long as the base station receives the E-TFCI corresponding to the TB, which is forbidden to be used, within a CFN, the base station considers by default that the UE switches to the 10-ms TTI in the next CFN. Accordingly, the UE can switch the TTI quickly to enhance the uplink coverage rapidly.

In step S120 of the embodiment of the present invention, the UE may also carry the switching confirmation information by adding an indicator to the media access control (MAC) header or scheduling information of the E-DPDCH. In this case, as shown in FIG. 2, the switching method according to the embodiment of the present invention, after step S120, may further include step S121: obtaining from the base station feedback information in response to the switching confirmation information. Step S130 includes step S131: after receiving the feedback information from the base station, switching the TTI in a next CFN.

For example, when the base station requires the UE to switch from the 2-ms TTI to the 10-ms TTI, the MAC header or scheduling information of the E-DPDCH may include the indicator carrying the switching confirmation information to confirm that the switching confirmation information is received and the TTI is to be switched. The indicator may be divided into two parts, that is, the indicator includes message type and content, or only includes several bits. For example, indicator P includes one bit. It may be defined that “P=1” indicates that switching is performed; and “P=0” indicates that switching is not performed.

The UE may also add an indicator to the MAC header or scheduling information within a plurality of continuous TTIs on the E-DPDCH to ensure that the base station correctly receives data. In this case, the UE needs to wait for the ACK or NACK message fed back from the base station. After receiving a last ACK or NACK message from the base station, the UE switches from the 2-ms TTI to the 10-ms TTI in a next CFN. Accordingly, the UE can switch the TTI quickly to enhance the uplink coverage rapidly.

In step S130 of the embodiment of the present invention, switching the TTI includes: obtaining reconfiguration resources for switching the TTI and switching the TTI in a next CFN, where the reconfiguration resources for the UE to switch the TTI are resources may be issued by the RNC to the UE in broadcast mode. Preferably, the reconfiguration resources for the UE to switch the TTI may be stored in the UE as default resources, so as to facilitate quick TTI switching and improve the uplink coverage.

In another embodiment of the present invention, a switching method of switching the TTI, before step S110, may include step S100: reporting a ratio of the UE maximum transmit power to the dedicated physical control channel (DPCH) power, where the ratio of the UE maximum transmit power to the dedicated physical control channel (DPCH) power is used by the base station to determine whether UE uplink transmit power is limited. Step S110 may include step S111: receiving the switching indication information sent by the base station when the base station determines that the UE uplink transmit power is limited, as shown in FIG. 3.

Preferably, the base station uses the ratio of the UE maximum transmit power to the dedicated physical control channel (DPCH) power (UE power headroom (UPH)) reported by the UE to determine whether the UE uplink transmit power is limited. The base station may calculate the UE maximum transmit power according to the UPH provided by the UE. If the maximum transmit power exceeds the maximum power configured by the RNC to the UE, the base station determines that the UE power is limited. Accordingly, the UE needs to switch from the 2-ms TTI to the 10-ms TTI to enhance the uplink coverage.

As shown in FIG. 4, an embodiment of the present invention also provides a switching method. The method includes:

Step S210: Send to a UE a switching indication information that requires a UE to switch a TTI.

Step S220: Receive from the UE a switching confirmation information with which the switching indication information is confirmed.

The base station directly instructs the UE to switch the TTI. Therefore, the notification sent from the Node B to RNC to instruct UE to switch the TTI is avoided. The delay of switching the TTI is shortened so as to hence implement quick TTI switching.

In step S220 of the embodiment of the present invention, the switching confirmation information received by the base station may be sent by the UE through the E-TFCI corresponding to the TB, which is forbidden to be used within the current TTI, on the E-DPCCH, or may be sent by adding the indicator to the MAC header or scheduling information of the E-DPDCH. When the base station receives the switching confirmation information sent by the UE by adding the indicator to the MAC header or scheduling information of the E-DPDCH, the switching method according to the embodiment of the present invention, after step S220, may include step S230: sending feedback information in response to the switching conformation information to the UE. Upon receiving the ACK or NACK message, the UE switches the TTI in a next CFN.

As shown in FIG. 5, in another embodiment of the present invention, the switching method of switching the TTI, before step S120, may include step S200: receiving a ratio of the maximum transmit power to the dedicated physical control channel (DPCH) power reported by the UE. Step S210 may include step S211: sending to the UE the switching indication information that requires the UE to switch the TTI after determining that the UE uplink transmit power is limited according to the ratio of the maximum transmit power to the dedicated physical control channel (DPCH) power. In step S211, the base station may carry the switching indication information by issuing an HS-SCCH order or by using other methods.

In still another embodiment of the present invention, the switching method of switching the TTI, after step S220, may include step S240: sending to the RNC a switching complete information indicating that the UE completes the TTI switching. After the UE completes the TTI switching, the base station may send to the RNC the switching complete information indicating that the UE completes the TTI switching so as to make preparation for communication within the switched TTI. Preferably, the base station carries the switching complete information by issuing Node B Application Part signaling (NBAP) signaling.

Therefore, with the switching method according to embodiments of the present invention, the delay of switching the TTI can be effectively shortened, so as to implement quick TTI switching and enhance the UE uplink coverage rapidly. In addition, according to embodiments of the present invention, network resources can be fully used and different manners are used to send the switching confirmation information to the base station quickly and conveniently.

The following describes an embodiment of a UE that performs TTI switching and an embodiment of a base station that is used for switching the TTI. Similarly, the UE and base station according to embodiments of the present invention can effectively shorten the delay of switching the TTI and complete quick TTI switching by using the switching method described in the preceding embodiments.

Referring to FIG. 6, a UE 100 of an embodiment of the present invention include: a first receiving module 110, a sending module 120, and a processing module 130. The first receiving module 110 is configured to receive from a base station a switching indication information that requires switching a TTI. The sending module 120 is configured to send to the base station a switching confirmation information with which the switching indication information is confirmed information. The processing module 130 is configured to switch the TTI.

Accordingly, the UE can effectively shorten the delay of switching the TTI, so as to complete the TTI switching quickly and enhance the uplink coverage.

In another embodiment of the present invention, as shown in FIG. 7 and FIG. 8, the UE 100 may further include: a reporting module 101, configured to report a ratio of the UE 100 maximum transmit power to the dedicated physical control channel (DPCH) power, where the ratio of the maximum transmit power to the dedicated physical control channel (DPCH) power is used by the base station to determine whether the UE 100 uplink transmit power is limited. The first receiving module 110 is configured to receive the switching indication information sent by the base station when the base station determines that the UE 100 uplink transmit power is limited.

In the embodiment of the present invention, the sending module 120 may include: a first sending subunit 121, configured to send the switching confirmation information to the base station through an E-TFCI corresponding to a TB, which is forbidden to be used within a current TTI, on an E-DPCCH, as shown in FIG. 7. The sending module 120 may further include: a second sending subunit 122, configured to send the switching confirmation information to the base station by adding an indicator to a MAC header or scheduling information of an E-DPDCH. The sending module 120 may also further include both a first sending subunit 121 and a second sending subunit 122, configured to send to the base station the switching confirmation information with which the switching indication information is confirmed.

When the sending module 120 includes the second sending subunit 122, the UE 100 may further include: a second receiving module 123 configured to receive from the base station feedback information in response to the switching confirmation information. The processing module 130 switches the TTI when the second receiving module 123 receives the feedback information.

In the embodiment of the present invention, as shown in FIG. 7 and FIG. 8, the processing module 130 may include an obtaining unit 131 and a reconfiguring unit 132. The obtaining unit 131 is configured to obtain reconfiguration resources for switching the TTI. The reconfiguring unit 132 is configured to reconfigure the TTI according to the reconfiguration resources. Preferably, the reconfiguration resources are broadcasted by an RNC; or more preferably, the reconfiguration resources are default reconfiguration resources stored in the UE 100.

Referring to FIG. 9, a base station 200 of an embodiment of the present invention includes: a first sending module 210, configured to send to a UE 100 a switching indication information that requires the UE 100 to switch a TTI; and a first receiving module 220, configured to receive from the UE 100 a switching confirmation information with which the switching indication information is confirmed.

In the preceding embodiment, as shown in FIG. 10, the base station 200 may further include a second receiving module 201 and a determining module 202. The second receiving module 201 is configured to receive a ratio of maximum transmit power to the dedicated physical control channel (DPCH) power reported by the UE 100. The determining module 202 is configured to determine whether the UE 100 uplink transmit power is limited according to the ratio of maximum transmit power to the dedicated physical control channel (DPCH) power. When the UE 100 uplink transmit power is limited, the first sending module 210 is configured to send to the UE 100 the switching indication information of switching the TTI. Preferably, the first sending module 210 sends the switching indication information to the UE 100 through an HS-SCCH order.

In another embodiment of the present invention, the base station 200 may further include a second sending module 221, configured to send feedback information in response to the switching confirmation information to the UE 100 when the first receiving module 220 receives the switching confirmation information that is sent by the UE 100 by adding an indicator to a MAC header or scheduling information of an E-DPDCH. The UE 100 switches the TTI in a next CFN after receiving the last ACK or NACK message from the base station 200.

In yet another embodiment of the present invention, the base station 200 may further include a third sending module 230, configured to send to an RNC a switching complete information indicating that a UE 100 completes the TTI switching. Preferably, the third sending module 230 sends the switching complete information to the RNC through NBAP signaling.

Therefore, with the switching method according to embodiments of the present invention, the delay of switching the TTI can be effectively shortened, so as to quickly complete the TTI switching and enhance the UE uplink coverage rapidly. In addition, according to embodiments of the present invention, network resources can be fully used and different manners are used to send the switching confirmation information to the base station quickly and conveniently.

It is understandable to those skilled in the art that the all or a part of steps of the communication method according to the embodiments of the present invention can be implemented by programs instructing relevant hardware. The programs may be stored in a computer readable storage medium. When the programs runs, the corresponding steps in the communication method are executed. The storage medium may be a read only memory (ROM), random access memory (RAM), a magnetic disk or a compact disk.

Although the present invention is described with reference to the accompanying drawings and in combination with exemplary embodiments, the present invention is not limited thereto. Those skilled in the art may make various equivalent modifications and refinements without departing from the principle and the spirit of the present invention, and modifications and refinements should fall within the protection scope of the present invention. 

The invention claimed is:
 1. A method comprising: receiving, by a user equipment (UE), a high-speed shared control channel (HS-SCCH) order carrying a switching indication information instructing the UE to switch a transmission time interval (TTI), wherein the switching indication information is received from a base station; sending to the base station a switching confirmation information, wherein the switching indication information is confirmed with the switching confirmation information; and switching the TTI.
 2. The method according to claim 1, wherein sending to the base station the switching confirmation information comprises: sending the switching confirmation information to the base station through a transport format combination indicator (TFCI) corresponding to a transport block (TB), which is forbidden to be used within a current TTI, on an enhanced dedicated channel (E-DCH) dedicated physical control channel (E-DPCCH); or sending the switching confirmation information to the base station by adding an indicator to a media access control (MAC) header or scheduling information of an enhanced dedicated channel (E-DCH) dedicated physical data channel (E-DPDCH).
 3. The method according to claim 1, further comprising: reporting a ratio of UE maximum transmit power to dedicated physical control channel (DPCH) power, wherein the ratio of the UE maximum transmit power to the dedicated physical control channel (DPCH) power is used by the base station to determine whether UE uplink transmit power is limited; wherein receiving the switching indication information comprises receiving the switching indication information sent by the base station if the base station determines that the UE uplink transmit power is limited.
 4. The method according to claim 1, further comprising: obtaining from the base station feedback information in response to the switching confirmation information; wherein switching the TTI comprises switching the TTI at a next connection frame number (CFN) upon receiving the feedback information from the base station.
 5. The method according to claim 1, wherein switching the TTI comprises: obtaining reconfiguration resources and switching the TTI in the next CFN in accordance with the reconfiguration resources, wherein the reconfiguration resources are broadcasted by a radio network controller (RNC) or are default reconfiguration resources stored in the UE.
 6. A method comprising: sending, by a base station, a high-speed shared control channel (HS-SCCH) order to a user equipment (UE), the HS-SCCH order carrying a switching indication information instructing the UE to switch a transmission time interval (TTI); and receiving from the UE a switching confirmation information confirming that the UE has switched the TTI.
 7. The method according to claim 6, wherein receiving the switching confirmation information comprises: receiving the switching confirmation information from the base station through a E-DCH transport format combination indicator (E-TFCI) corresponding to a transport block (TB), which is forbidden to be used within a current TTI, on an enhanced dedicated channel (E-DCH) dedicated physical control channel (E-DPCCH); or receiving the switching confirmation information that is sent by the UE by adding an indicator to a media access control (MAC) header or scheduling information of an enhanced dedicated channel (E-DCH) dedicated physical data channel (E-DPDCH).
 8. The method according to claim 6, further comprising: receiving a ratio of maximum transmit power to dedicated physical control channel (DPCH) power reported by the UE, wherein the ratio of the maximum transmit power to the dedicated physical control channel (DPCH) power is used to determine whether UE uplink transmit power is limited; wherein sending to the UE the switching indication information that requires the UE to switch the TTI comprises: sending the switching indication information to the UE, after determining that the UE uplink transmit power is limited according to the ratio of the maximum transmit power to the DPCH power reported by the UE.
 9. The method according to claim 6, wherein after receiving from the UE the switching confirmation information, the method further comprises: sending feedback information in response to the switching confirmation information to the UE.
 10. The method according to claim 6, wherein after receiving from the UE the switching confirmation information, the method further comprises: sending to a radio network controller (RNC) a switching complete information indicating that the UE has switched the TTI.
 11. The method according to claim 10, wherein sending to the RNC the switching complete information comprises: sending the switching complete information to the RNC through Node B Application Part (NBAP) signaling.
 12. A user equipment (UE), comprising: a first receiving module, configured to receive a high-speed shared control channel (HS-SCCH) order from a base station, the HS-SCCH order carrying a switching indication information that instructs the UE to switch a transmission time interval (TTI); a sending module, configured to send a switching confirmation information with which the switching indication information is confirmed; and a processing module, configured to switch the TTI.
 13. The UE according to claim 12, wherein the sending module comprises a first sending subunit or a second sending subunit, wherein the first sending subunit is configured to send the switching confirmation information to the base station through an E-DCH transport format combination indicator, E-TFCI, corresponding to a transport block, TB, which is forbidden to be used within a current TTI, on an enhanced dedicated channel, E-DCH, physical control channel, E-DPCCH; and a second sending subunit is configured to send the switching confirmation information to the base station by adding an indicator to a media access control, MAC, header or scheduling information of an enhanced dedicated physical data channel, E-DPDCH.
 14. The UE according to claim 12, further comprising: a reporting module, configured to report a ratio of UE maximum transmit power to dedicated physical control channel (DPCH) power, wherein the ratio of the UE maximum transmit power to the DPCH power is used by the base station to determine whether UE uplink transmit power is limited; wherein the first receiving module is further configured to receive the switching indication information sent by the base station if the base station determines that the UE uplink transmit power is limited.
 15. The UE according to claim 12, further comprising a second receiving module, configured to receive from the base station feedback information in response to the switching confirmation information; wherein the processing module is further configured to switch the TTI if the second receiving module receives the feedback information.
 16. The UE according to claim 12, wherein the processing module comprises: an obtaining unit, configured to obtain reconfiguration resources; and a reconfiguring unit, configured to switch the TTI according to the reconfiguration resources; wherein the reconfiguration resources are broadcasted by a radio network controller (RNC) or default reconfiguration resources stored in the UE.
 17. A base station, comprising: a first sending module, configured to send a high-speed shared control channel (HS-SCCH) order to a user equipment (UE), the HS-SCCH order carrying a switching indication information that instructs the UE to switch a transmission time interval (TTI); and a receiving module, configured to receive from the UE a switching confirmation information with which the switching indication information is confirmed.
 18. The base station according to claim 17, further comprising a second sending module, configured to send feedback information in response to the switching confirmation information to the UE if the first receiving module receives the switching confirmation information that is sent by the UE by adding an indicator to a media access control, MAC, header or scheduling information of an enhanced dedicated channel, E-DCH, dedicated physical data channel, E-DPDCH.
 19. The base station according to claim 17, further comprising: a second receiving module, configured to receive a ratio of maximum transmit power to dedicated physical control channel (DPCH) power reported by the UE, and a determining module, configured to determine whether UE uplink transmit power is limited according to the ratio of the maximum transmit power to the DPCH power; wherein the first sending module is further configured to send the switching indication information to the UE if the determining module determines that the UE uplink transmit power is limited.
 20. The base station according to claim 17, further comprising a third sending module, configured to send to a radio network controller (RNC) a switching complete information indicating that the UE has switched the TTI. 